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40 A. M. YASA and H. AKYILDIZ
RISK INDEX (RI)
SEVERITY (SI)
FI FREQUENCY 1 23 4
Catastrophic
7 Frequent Minor Significant Severe
6 11
5 Reasonably probable 8 9 10 10
4 9
3 Remote 7 89 8
2 7
1 Extremely remote 6 78 6
5
5 67
4 56
3 45
2 34
In accordance with commission experience and meeting as well as historical data and occurred
accidents, ranking tables have been created as follows in Table 2 and Table 3. For both accident
category, several RRNs have been on first priority. Considering all these effects into account, it
has been decided to focus on "Human Error" for Collision/Contact/Allision sub category and
"Equipment/Machinery Failure (Engine Room) for Fire/Explosion sub category. When the RRN
numbers have been checked, these two have been identified as riskiest accident sub category.
Together with these processes, also fault tree method has been used to complete step 2. FTA
analysis for Human Error and Equipment/Machinery Failure (Engine Room) have been given in
Fig. 5 and Fig 6. below.
Fig. 5. FTA of contact/collision/allision category and fire/explosion category
GiDB|DERGi Sayı 8, 2017
